A two-year-old and a five-year-old in ABA therapy are working on almost nothing in common, even though both fall under the same broad label parents hear at diagnosis. The method stays constant: break a skill into teachable pieces, reinforce progress, track data, adjust the plan. What changes, year by year, is everything else: where therapy happens, what it targets, and how much of it your child needs.

That gap between the label and the day-to-day reality is where most of the questions we hear from Colorado parents live. At Achieve ABA Therapy Group, our early intervention and in-home teams work with children across this exact age range, and the plan a family sees at intake looks nothing like the plan they will see eighteen months later. Here is what tends to change at each stage, and what holds steady no matter your child’s age.

In short: ABA therapy for preschoolers uses the same core method at every age, communication, play-based teaching, and individualized goals, but what a session looks like, what it targets, and how many hours it takes changes completely between age 2 and age 5.

What ABA Therapy for Preschoolers Involves at Every Age

ABA therapy for preschoolers uses the same core method at every age: break a skill into teachable steps, reinforce progress, track data, and adjust the plan. What changes is the target skills and the setting, not the method itself. If you want the fundamentals explained from the ground up, our guide to what ABA actually is covers that; here we are focused on how those fundamentals play out differently by age.

ABA Therapy Goals Are Individualized for Each Child

No two children the same age get identical plans. A BCBA builds goals around an assessment of your specific child, not a standard preschool curriculum, and updates that plan as your child masters skills or the picture shifts. That individualized, assessment-driven approach is part of why ABA is recognized as an evidence-based practice for autism rather than just one option among many.

ABA Therapy Sessions Use Play-Based Teaching, Not Worksheets

Regardless of age, a strong program spends far more time on the floor, at the sink, in the sandbox, than at a table. Our post on discrete trial training breaks down how structured teaching moments fit into that mix without turning your living room into a classroom.

What the First ABA Assessment Looks Like for a Preschooler

Before any goals get written, a BCBA spends time actually watching your child, not just asking you questions about them.

The Tools Used to Assess a Preschooler’s Skills

Most preschool-age assessments draw on standardized tools built specifically for this age range, most commonly the VB-MAPP (Verbal Behavior Milestones Assessment and Placement Program) or the ABLLS-R (Assessment of Basic Language and Learning Skills, Revised). 

Both work like detailed checklists across communication, play, social, and self-help skills, giving your BCBA a starting map of what your child can already do independently, what they can do with support, and what is not yet present at all.

How Assessment Results Become a Treatment Plan

The assessment itself usually takes one to a few sessions, often blended with play so it does not feel like testing to your child. From there, your BCBA turns the results into a written treatment plan: specific, measurable goals, the teaching procedures that will be used for each one, and a plan for how progress will be tracked and reported back to you.

The Developmental Domains a Preschool ABA Program Targets

Every preschooler’s plan is individualized, but the goals almost always fall into the same handful of areas. Knowing these upfront makes it easier to understand why a given age’s goals look the way they do further down.

• Communication: requesting, labeling, answering questions, and for some children, learning to use an AAC device or picture system alongside or instead of speech
• Social and play skills: joint attention, imitation, turn-taking, and eventually playing alongside or with peers rather than only adults
• Self-help and adaptive skills: dressing, toileting, mealtime independence, and following a routine with less adult support over time
• Pre-academic and cognitive skills: colors, shapes, counting, and matching, usually introduced closer to age four
• Behavior: reducing behaviors that get in the way of learning or safety, like elopement, aggression, or self-injury. Our post on aggression in young autistic children goes deeper on how we think about the function behind a behavior before trying to change it.

ABA Therapy for 2-Year-Olds: Building Communication and Connection

ABA therapy for a 2-year-old focuses on communication, connection, and play, not seated academic work. Most two-year-olds we work with are still in Colorado’s Early Intervention system, known as Part C, which covers evaluation and services for children under three. 

Our guide to early intervention eligibility and costs in Colorado covers that program in detail. And our own early intervention program follows the same play-based, in-home model Part C is built around.

What an ABA Therapy Session Looks Like at Age 2

A session at this age rarely resembles what parents picture as therapy. It looks like snack time, block play, a walk to the mailbox, with a therapist narrating, modeling, and creating small moments where your child has a reason to communicate. Building trust with a brand-new therapist happens here too, before any real teaching starts.

ABA Therapy Goals for 2-Year-Olds

• Requesting a want or need in some reliable way, whether that is a word, a sign, a picture, or a gesture
• Joint attention: sharing focus on an object or event with another person
• Imitating simple actions and sounds
• Tolerating brief separations and transitions between activities

Example goal: request a preferred snack or toy using a word, sign, or picture in 4 of 5 opportunities, across two different adults.

For children who are not yet using words reliably, this is often when a family first hears about AAC, augmentative and alternative communication, as an option worth exploring alongside or instead of spoken language.

ABA Therapy for 3-Year-Olds: The Preschool Transition

ABA therapy for a 3-year-old often coincides with a major systems change in Colorado, not because your child changes overnight, but because the system around them does. Early Intervention through Part C ends at the third birthday. Support beyond that point runs through your local school district’s Child Find process under the Colorado Department of Education’s evaluation guidelines, private ABA, or both.

What Changes When Early Intervention Ends at Age 3

• Eligibility shifts from Part C, birth to three, to Part B preschool special education, evaluated separately by your school district
• Sessions may move from purely in-home to a blend of in-home, daycare-based, or preschool classroom support
• Goals typically expand from requesting and imitating into following multi-step directions and early peer interaction

ABA Therapy Goals for 3-Year-Olds

By three, many children are working on expanding language into short phrases, following two-step directions, and early self-help skills like washing hands or taking off a coat. Sessions still lean heavily on play, but a bit more structure, brief seated activities, simple turn-taking games, starts to show up alongside it.

Example goal: follow a two-step direction given during a daily routine, such as “get your shoes and bring them to me,” in 8 of 10 opportunities.

ABA Therapy for 4-Year-Olds: Group Skills and Preschool Readiness

ABA therapy for a 4-year-old increasingly targets group skills, since four is often when Colorado children start a daycare or preschool program, sometimes through Colorado’s Universal Preschool, which means your child’s ABA team is no longer the only adult teaching them for part of the week. 

Our daycare-based ABA program puts a therapist directly inside that setting, and our guide to choosing a daycare for an autistic child in Colorado covers how to find a program that works well alongside outside providers.

ABA Therapy Sessions Blended With Daycare or Preschool

Rather than working only at home, a therapist may spend part of the week inside your child’s classroom or daycare room, so skills learned in one setting are more likely to show up in the other instead of staying tied to a single room.

ABA Therapy Goals for 4-Year-Olds

• Following instructions given to a small group, not just one-on-one
• Waiting for a turn and tolerating a peer’s turn
• Early pre-academic skills: colors, shapes, counting, matching
• Managing louder, busier environments without escalating

Example goal: wait for a turn during a group activity for up to two minutes without adult prompting.

ABA Therapy for 5-Year-Olds: Getting Ready for Kindergarten

ABA therapy for a 5-year-old shifts toward independence: doing a skill without an adult standing next to your child prompting it, not just learning the skill itself. If kindergarten is on the horizon, our kindergarten readiness checklist goes deeper on exactly what to prepare for before the first day.

ABA Therapy Goals for 5-Year-Olds Focus on Independence

• Following classroom-style routines and transitions across a full day
• Requesting help or a break from an unfamiliar adult, not just a familiar therapist
• Generalizing skills across settings: home, therapy, and a future classroom

Example goal: request help from an unfamiliar adult using a full sentence, without an adult modeling the request first.

How School-Based ABA Therapy Works With an IEP

For children heading into a public school setting, ABA can continue there directly. Our overview of school-based ABA and how it works with an IEP explains how that coordination with a school team actually happens.

Who Is Typically on a Preschooler’s ABA Team

A preschooler’s team is usually smaller than people expect, and you are the person on it who spends the most hours with your child.

The Core Team: a BCBA and an RBT

A Board Certified Behavior Analyst (BCBA) designs and oversees the treatment plan, while a Registered Behavior Technician (RBT) typically delivers the day-to-day sessions under that BCBA’s supervision. Your BCBA checks in regularly to review data and adjust goals, even on weeks when they are not the one running the session.

Working Alongside Speech and Occupational Therapy

Many preschoolers on an ABA program are also seeing a speech-language pathologist, an occupational therapist, or both. A good ABA team coordinates with those providers rather than working in a silo, especially around communication goals. Our comparison of ABA, speech, and occupational therapy breaks down what each discipline actually covers if you are trying to figure out who handles what.

How Many ABA Therapy Hours Do Preschoolers Need?

There is no single number. Hours vary by child, and your BCBA sets a recommendation based on assessment, not a fixed number pulled from a chart. In general, younger children in comprehensive programs tend to receive more hours per week than school-age children in more focused programs. Our full breakdown of ABA therapy costs and hours in Colorado covers the typical ranges, what drives them, and what families usually pay.

Signs an ABA Program Is Working for Your Preschooler

Progress at this age does not always look like a new word appearing overnight. It is worth knowing what to actually watch for.

• Your child’s therapist can show you data, not just tell you things are “going well”
• Skills practiced in session start showing up at home or daycare without you asking
• Goals get updated as your child masters them, rather than sitting unchanged for months
• You are being taught the same strategies your child’s therapist uses, not just observing from the couch
• Your child seems more comfortable with transitions and new people over time, not just more compliant in session

What Parents Should Know Before Starting ABA Therapy

Progress at this age is rarely a straight line. Skills that looked solid in March can look shaky in August, especially around a transition like starting daycare or preschool. That is normal, not a sign that something is wrong.

• No ethical provider can promise a specific outcome by a specific age or grade
• Your involvement between sessions matters as much as the sessions themselves, which is the entire premise behind parent training
• A plan that looked right at two may look completely different at five, and that is the system working as intended, not failing

ABA Therapy for Preschoolers Changes as Your Child Grows

Ages 2 through 5 cover more developmental change than almost any other stretch of childhood, and a good ABA program changes right along with it. What your child is working on today is a snapshot, not a fixed identity, and the goal at every stage is the same: skills that make the next stage easier.

If you are trying to figure out where your child fits in this range, or whether it is time to start, our team is glad to talk through what a plan built around your specific child could look like. Reach out to us today!

ABA Therapy for Preschoolers: Frequently Asked Questions

Is it too late to start ABA if my child was not diagnosed until preschool age?

No. Early Intervention through Part C ends at three, but ABA therapy itself does not have an age cutoff at the front end. Many children start their first program at three, four, or five, and the same core methods apply regardless of when they begin.

Will my child still qualify for support after aging out of Early Intervention at three?

Many do, either through preschool special education, continued private ABA, or both. Eligibility for school-based services is evaluated separately from your child’s Part C eligibility, and your service coordinator can help start that referral before the third birthday.

Can ABA happen at the same time as preschool or daycare?

Yes, and for a lot of families this is the norm rather than the exception. We cover how daycare-based ABA and an outside daycare or preschool program typically work together earlier in this guide.

How do I know if my 2-year-old needs ABA or just needs more time?

A good starting point is a developmental milestone checklist for your child’s exact age, like the free ones CDC publishes, which can help you decide whether to raise a concern with your pediatrician now or keep watching.

Does insurance cover ABA therapy for preschoolers in Colorado?

Most major Colorado plans and Health First Colorado cover ABA therapy for eligible children, though authorization requirements and hours vary by plan. Our insurance page lists the plans we work with, and our team verifies coverage before therapy starts.

What if my child is about to start kindergarten and still needs support?

ABA can continue into and through the school years, often coordinated directly with your child’s school team. We cover that transition, and a dedicated kindergarten readiness checklist, earlier in this guide.

What assessment tools are used to evaluate a preschooler for ABA therapy?

Most preschool-age evaluations use a standardized tool built for this age range, most often the VB-MAPP or the ABLLS-R, alongside direct observation and a conversation with you about your priorities and concerns.

Does my child need to already talk to start ABA therapy?

No. Many children start ABA with no reliable spoken words at all, and building a first way to communicate, whether that is speech, sign, or an AAC device, is often the very first goal on the plan.

Sources

• Steinbrenner, J. R., Hume, K., Odom, S. L., et al. (2020). Evidence-based practices for children, youth, and young adults with autism. University of North Carolina at Chapel Hill, Frank Porter Graham Child Development Institute, National Clearinghouse on Autism Evidence and Practice. https://ncaep.fpg.unc.edu/
• Colorado Department of Education. (n.d.). Guidelines for the educational evaluation of autism spectrum disorder. https://www.cde.state.co.us/cdesped/asd_guidelines
• Colorado Department of Education. (n.d.). Early childhood special education resources and guidance. https://www.cde.state.co.us/cdesped/cfpreresources
• Colorado Department of Early Childhood. (n.d.). Universal Preschool Colorado. https://cdec.colorado.gov/universal-preschool-colorado